Good , Serratia, Yersinia, Brucella, Campylobacter, Haemophilus,

and Pasteurella most P. aeruginosa. Gram (+) S. aureus is usually susceptible though acquired resistance is becoming more common. Prototheca susceptible. Tobramycin may be active against more isolates of P. aeruginosa than is gentamicin (2/3 of Gentamicin resistant organisms are susceptible).